A panel of medical experts says cough medicines like Robitussin should continue to be sold over-the-counter, despite increasing abuse among teenagers that has prompted calls to restrict the products.

The Food and Drug Administration panel voted 15-9 against a proposal that would require a doctor’s note to buy medicines containing dextromethorphan, an ingredient found in more than 100 over-the-counter medications.

Abuse of the products, dubbed “robotripping,” is on the rise, with more than 8,000 emergency room visits linked to the practice in 2008. Law enforcement officials asked the FDA to reconsider how it regulates the products.

But experts at Tuesday’s meeting said making the products prescription-only would be overly burdensome.